MESON Chess Problem Database

Problem Display
PID: 110515 (8/8/8/5K1k/8/8/5b2/1Q6 w - - 0 1)

Courtenay, Edward H

Brownson's Chess Journal, 1870

8/8/8/5K1k/8/8/5b2/1Q6

#2

2 + 2

6490 yacpdb 2009
5454 Near Snap 2018
3713 Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Be3
      • 2.Qh1#
    • 1...Bd4
      • 2.Qh1#
    • 1...Bc5
      • 2.Qh1#
    • 1...Bb6
      • 2.Qh1#
    • 1...Ba7
      • 2.Qh1#
  • Tries
    • 1.Qa1?
      • threat
        • 2.Qh8#
      • 1...Kh6
        • 2.Qh8#
      • 1...Be3
        • 2.Qh1#
      • 1...Bd4
        • 2.Qh1#
      • 1...Kh4!
    • 1.Qd1+?
      • 1...Kh4
        • 2.Qg4#
      • 1...Kh6!
    • 1.Qb2?
      • threat
        • 2.Qh8#
      • 1...Kh6
        • 2.Qh8#
      • 1...Be3
        • 2.Qh2#
      • 1...Bd4
        • 2.Qh2#
      • 1...Kh4!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Qh8#
      • 1...Kh4
        • 2.Qh2#
      • 1...Kh6
        • 2.Qh8#
      • 1...Be3
        • 2.Qh2#
      • 1...Bd4
        • 2.Qh2#

Anticipated by 47227(1849)

This anticipates 36807(1898), 183106(1907), 193729(1916), 166257(1917), 149134(1929), 172254(1996), 173962(2005), 169981(2017)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • B(a);N_GUARD::QAR(A)
    • B(a);N_GUARD,SBLOCK::QAR(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • K(b);P-FLIGHT::QAR2(A)
        • B(a);N_GUARD::QAR(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • K(b);P-FLIGHT::QAR2(A)
        • B(a);OGATE::QAR(A)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR(A)
    • Vars
      • K(b);P-FLIGHT::QAR2(A)
      • B(a);N_GUARD::QAR(A)
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